Chuck.



PATENTED NOV. 5,1907 v. J. WAHLSTROM.

CHUCK.

APPLIUAIZOI FILED 06125, 1908.

Fig

VERNER J. WAHLSTROM, OF NEW YORK, N. Y

Specification of Letters Patent. I

Patented Nov. 5; 1907.

Application file 00M 25. 19 6- Serial No. 340.522.

' To all whom it may comm:

Be it known that I, Vsnxnn J. Wnntsrnosr, a citihen of the" United States, residing at New York, in the county of Kings and State of New York, have invented a new and useful Chuck, of which the following is a specification.

lhis invention relates to an improvement in chucks. Heretofore, chucks have been constructed in which a. series of rollers were used, the rollers operating on inclined faces and contacting with the tool shank, so

' that as the resistance increased during the drilling operation the rollers were caused to roll up on the inclined faces and bite the tool shank with increased force. The ang.e of inclination of the face uphn which the roller operates is necessarily limited. to prevent the roller from slipping hack. and the'limge oi the chuck,

that is, the number of different sized drills which it can accommodate, is limited, and this is objectionable.

It is oneof the objectsof this invention to provide a chuck in which a wider range is obtained.

Another object i to provide a chuck having jaws moved radially toward and away from the axis of the chuck, the biting action being effected by rollers operating'on inclined facts on the jaws so that only a very limited movement of the roller is necessary to hold the drill shank after it has been brought into contact with the same.

With this uni other objects in view, the invention consists in certain constructions and cornbrnatrons which will be hereinafter fully described and then specifically pointed out .in the claims hereunto oppended.

In the dmwings which form a part of this specification and in which like characters of reference indicate I the same parts, Figure l is an elevation of a structure embodying the invention, Fig. 2 is an elevation, partly in section, of the structure ohownjn Fig. 1, Fig. 3 is an end view of the body portion of the chuck, Fig. 4 is an elevation of the body portion of the chuck, partly in section on the line H of Fig. 3, Fig. 5 is an enlarged detail view of one of the jaws, and Fig. 6 is a section on the line 66 of Fig. 5.

In carrying-the invention into effect, a radially mov- V able jaw having an inclined face is employed and this jaw carries a roller which is arranged to be rolled up the inclined face of the jaw by resistance of the tool shank to the turning movement of the chuck. 'The jaw may vary in form within wide in-its; but in the best constructions and as shown, a jaw 1 in employed having an inclined face 2-and carrying a roller 3 on its operating edge. In the device illustrated, the jaw is provided with a tapered face 4, the purpose of which will be hereinafter explained. While the roller 3 might be otherwise held in position; as shown, it is provided at eitherend with a stud 5 which is loosely fitted in a slot 6 cut transversely in the jaw, the slot 6 being wide enough to permit the roller being thrown in and out of contact with the inclined face 2. Means are provided for normally k eping the roller out contact with the inclined ace and this means may vary widely; as shown, spring actuated means are employedfor this purpose and consist of a pair of plungers 7 mounted to slide in recesses 8 cut in the jaw, the plunger-s 7 being held against the roller by'means of springs 9. The operation of this part of the structure is as follows: The jaw is moved toward the axis of the chuck by any suitable means and after the roller 3 comes in contact with the shank of the tool a further movement of the jaw results in the springs 9 being compresed and the roller 3 forced against the inclined face 2. The resistance of the tool shank to the rotating movement of the chuck then causes the roller to ride up the inclined face 2 and bite the tool shank harder as the resistance increases. Owing to the fact that the roller is seated against the inclined face before it comes into operation, a very slightrolling movement is all that is necessary to bite the tool shank hard. When the tool is to he released. the jaw is moved in the opposite direction and the plunger 7 returns the roller and (i. n

In the best constructions and a shown, a plurality of radially movable jaws each having an inclined face and cach carrying a roller operating on said iaccm is employed, and when, as in the present invention, three of such jaws are used, they are spaced 120 degrees apart, as is clearly shown in Fig. 3.

When a plurality of jaws are used they are mounted in a chuck-body l0, partly cylindrical and partly conical in form, radial sluts ll being cut through the walls of the conical portion of the body and into. a

central aperture l2 within which the tool shank is inserted. The tapered face of the jaws, hereinbefore described, is of the same angle as that of the conical portion of the chuclcbody l0, and during thcir'move ment in fne'slots 11 these faces are maintained in parallelism.

Spring actuated means are employed to move the jaws outwardly or own y from the axis of the aperture,

and while these nn-aus may vary: as shown, a spring 13 is employed for this purpose: This spring is wound in an open coil around {post 14 fast in the chuck-body and workingin a hole 15 in the jaw, the-post serving to guide both the jaw and the spring.

Means are provided for positively moving the jaws toward the axis of the chuck for the purpose of bringing the roller 3 into contact with the tool shank and these means may vary within wide limits; as shown, a sleeve- 16 is employed which is partly cylindrical partly conical in form, the cylindrical portion of the sleeve fitting loosely over the c liudrical portion of h kto its normal position which is that shown in Figs. 5

body 10 and the conical portion of the sleeve fitting loosely over the conical portion of the chuck-body surrounding the same and contacting with the tapered faces of the jaws 1.. It will be readily understood i that if the sleevel6 is moved downwardly the conical l portion of the same will leave the conical portion of the chuck-body and the'jsws permitted to be moved outfiward by the springs 13, and that when the sleeve is -.movd in an upward direction the jaws will be posi- 10 tively moved toward the axis of the chuck. While tin sleev'e might be moved vertically to effect the move- ."ineht of the jaws; as shown, a spiral'movemeut is jlg iven'to the sleeve the object of the spiral movement to effect the downward movement through a relative rotary movement between the sleeve and the chuck-body so that. the jaws may move while the H chuck is running by simply grasping the sleeve and lding it against rotation Ioran'instant, long enough release the tool. To effect this spiral movement the portion of the chuck-body is provided spiral slot 17 in which works a stud 18 carried sleeve 16. The slot 17 is so formed that when .athe sleeve 16 is stopped by the operator the sleeve will given-a spirally downward movement, relieving the pressure of the jaws and permitting them to move bukwll'dtoreleasethetool.

' git is also desirable to insert a tool shank in the apert'iuc 12 and to cause it to be caught, while the chuck iljirunning. A .=,The means for positively moving the jaws toward f vthe'a xis of the chuck to catch and hold the tool shank jjefiected, inthe device illustrated, by an upward movement of the sleeve 16 and this movement may be prpdu ced by any suitable means. As shown, this movement 18 effected by means of a spring 19 -coil ed the shank 20 of the chuck-body and blaring one end last in the chuck-body and the other end ill-st in n plate 21 surrounding the shank 20 .and inst to the sleeve 16, as is clearly shown in Fig. 2. I0 Changes and variations may be made in the struc- -"-ture by which the invention is carried into effect. The invention, therefore, is not tb be limited to the precise details of the structure shown and described. I Whatisclaimed is: 1.!!! chuck, the comblnatlon wltb a radlally movuble w hsvlng ll] inclined race. of a roller carried by said 'jsw and arranged to be rolled up sald lncllned l'uce by con- Met with a tool shank, substantially as described.

2. In I chuck, the combination with a rudlnlly movable 0 jaw having an Inclined race, of s roller carrlcd by snld Ind a ranged to he rolled up slid inclined face by contlct wllh a tool shank, and menus for normally keeplag the roller out of contact with the lncllncd face, sub- Y stcntlllly no described. 5 3. In a chuck, the cumblnatlon with a radlally movable i M hsvlng an inclined Inc" of a roller currled by suld ,fiw end arranged to be rollec in said inclined face by contlt with a tool shank, and sprlug actuated means for normally holding the roller out of contact with the incllncd Ince, lubstnutlally as described.

J 4.]: a chuck, the combination wlth a radially movable )ur lmvlu nu inclined face at n roller having at each and n stud loosely fitted ln s transverse slot in the jar,

the wldth of the slot lelng sufllclent to permit of the roller belng thrown In and out of contact v'"b the lncllned face. and sprlug plungers located in thejaw for normally holdlng the roller out or contact with the lncllned (ace, substantlally us \lescrlbcd.

5. In a chuck, the comblnstlon wlth a chuck-body having a central aperture and radlel slots cut through the walls of the body into the aperture, of a plurallty of jaw! mounted in suld slots each Jaw bavlng an lucllned face, I plurality or'rollers ne of whlcb ls carrled by each jaw and arranged to be rolled up said lncllned face by contact with a tool shank, means for posltlvcly movlng the Jaws toward the axis of the chuck, and spring actuated means for moving the jawscutwurd, substantially as described.

6. In a chuck, the comblnatlon wlth P. chuck-body havlng a central apertureand radlnl slots cut through the walls or the body lnto the aperture, 0! n plurality of Jaws mounted In said slots each jaw having an lncllncd hce, a plurallty of rollers one of wblch ls cnrrled by each jaw and arranged to her-oiled up said lnclined'face by contact wlth a tool shank, spr 'rg actuated means for positively unovlng the jaws toward me axis of the chuck, and sprlng actuated means for moving the Jaws outwnrd subsmntlully as described.

7. In a chuck, the comblnntlon wlth a chuck-body partly cyllndrlcnl and partly conlcnl ln 'shspe hsvlng a central aperture thereln' and a. plurallty of rndlnl slots cut through the conlcul walls, of a plursllty of tapered jaws mounted in sald slots each jaw havlng an lncllned face, plursllly ot rollers one or whlch ls carrled by each jaw :md arranged to be rolled up sald inclined face by contact wi h a tool shank, sprlngs for moving the jaws outwardly, a sleeve surroundlng the conical portlon of the body and contacting with the tapered edges of the jaws, and means for produclng a longltudlnal movement or the sleeve to positively move the ja'ws toward the axis of the aperture, subslautlally us descrlbed.

8. In a chuck. the combluutlon wlth a chuck-body partly cyllndrlcal and partly conical ln shape having a central aperture therein and a plurallty of radial slots cut through the conical walls, or a plurallly of tapered jaw: mounted in sald slots each jaw having an Inclined face, n plurality of rollers one of which ls carried by each jaw and a ranged to be rolled up sold lncllued lace by contact with a tool shank, springs [or moving'lhe jaws outwardly,

-11 sleeve surrounding the cylindrical and conlcal parts of plurality of rollers one of whlch ls currled by each jaw and arranged to be rolled up sald lncllned face by contact "11! a tool shank, sprlngs Ior movlng the jaws outwardly, a sleeve surrounding the cyllndrlcul and conical portion of the body the conlcul pdr lon or the sleeve contacting wlth the tapered edges of-the jaws, n splral slot in the cylindrical portlon of the body, a stud fitted In the sleeve and worklng ln said slot, and a sprlng for rotutlng the sleeve whereby the sleeve ls glven a splrsl movement to positively move the Jaws toward the axis 0! the aperture, substantially as described.

In testlmouy whereof, I have slgned my name to thla speclrlcutlou ln the presence of two subscribing wltuesses.

vnsnsn I, lVAllLSTROM.

l as, 

